Finding the Fourth Proportional to 9,072.72, 12,509.64 and 7,742.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,072.72 : 12,509.64 = 7,742.16 : x
2. Step 2: Convert to fraction form
   9,072.72/12,509.64 = 7,742.16/x
3. Step 3: Cross multiply
   9,072.72x = 12,509.64 × 7,742.16
4. Step 4: Simplify right side
   9,072.72x = 96,851,634.42
5. Step 5: Solve for x
   x = 96,851,634.42/9,072.72
6. Step 6: Final answer
   x = 10,675.04